export function foo1(): string {
  return '1' as any;
}

export function foo2(): string {
  return Object.create(null) as any;
}

export const foo3 = (): object[] => [] as any;
export const foo4 = (): string[] => ['a'] as any;

export function assignability1(): Set<string> {
  return new Set<string>(['foo']) as any;
}